TestODataLinkInterceptor.java

package com.temenos.interaction.media.odata.xml.atom;

/*
 * #%L
 * interaction-media-odata-xml
 * %%
 * Copyright (C) 2012 - 2014 Temenos Holdings N.V.
 * %%
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 * #L%
 */


import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import static org.mockito.Matchers.any;
import static org.mockito.Mockito.mock;
import static org.mockito.Mockito.when;

import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.HttpMethod;

import org.junit.Test;
import org.odata4j.format.xml.XmlFormatWriter;

import com.temenos.interaction.core.hypermedia.Action;
import com.temenos.interaction.core.hypermedia.CollectionResourceState;
import com.temenos.interaction.core.hypermedia.Link;
import com.temenos.interaction.core.hypermedia.ResourceState;
import com.temenos.interaction.core.hypermedia.Transition;
import com.temenos.interaction.core.resource.RESTResource;


public class TestODataLinkInterceptor {

    private AtomXMLProvider createMockProviderFundsTransfers() {
        AtomXMLProvider mockProviderHelper = mock(AtomXMLProvider.class);
        when(mockProviderHelper.getEntitySet(any(ResourceState.class))).thenReturn("FundsTransfers");
        return mockProviderHelper;
    }

    private AtomXMLProvider createMockProviderCustomers() {
        AtomXMLProvider mockProviderHelper = mock(AtomXMLProvider.class);
        when(mockProviderHelper.getEntitySet(any(ResourceState.class))).thenReturn("Customers");
        return mockProviderHelper;
    }
    
    @Test
    public void testNullLinkToAddAddLinkArg() {     
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource resource = mock(RESTResource.class);
        
        List<Link> links = new ArrayList<Link>();
        links.add(mock(Link.class));        
        when(resource.getLinks()).thenReturn(links);
        
        Link result = linkInterceptor.addingLink(resource, null);
        
        assertNull(result);     
    }
    
    @Test
    public void testNullResourceAddLinkArg() {
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("customer", "Customer", false));

    
        linkInterceptor.addingLink(null, new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
    }
    
    @Test
    public void testResourceWithNullLinkAddLinkArg() {      
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource resource = mock(RESTResource.class);
        
        List<Link> links = new ArrayList<Link>();
        links.add(mock(Link.class));
        links.add(null);
        links.add(mock(Link.class));        
        when(resource.getLinks()).thenReturn(links); 
                        
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("customer", "Customer", false));
        
        Link link = new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET);
        Link result = linkInterceptor.addingLink(resource, link);       
        
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Customer", result.getRel());
    }

    @Test
    public void testNullLinkToAddAndResourceWithNullLinkAddLinkArgs() {     
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource resource = mock(RESTResource.class);
        
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("customer", "Customer", false));
        
        List<Link> links = new ArrayList<Link>();
        Link link = new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET);
        links.add(link);
        links.add(null);
        links.add(mock(Link.class));        
        when(resource.getLinks()).thenReturn(links); 
                        

        Link result = linkInterceptor.addingLink(resource, null);       

        assertNull(result);
    }
    
    @Test
    public void testLinkRelationCollectionToItem() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("customer", "Customer", false));
        
        
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Customer", result.getRel());
    }

    @Test
    public void testLinkRelationCollectionToItemSameEntity() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("fundsTransfer", "FundsTransfer", false));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("self", result.getRel());
    }

    @Test
    public void testLinkRelationItemToCollection() {
        Transition t = createMockTransition(
                createMockResourceState("account", "Account", false), 
                createMockResourceState("FundsTransfers", "FundsTransfer", true));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfers", result.getRel());
    }

    @Test
    public void testLinkRelationItemToItem() {
        Transition t = createMockTransition(
                createMockResourceState("account", "Account", false), 
                createMockResourceState("FundsTransfers_new", "FundsTransfer", false));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfer", result.getRel());
    }

    @Test
    public void testLinkFixedRelation() {
        CollectionResourceState targetState = mock(CollectionResourceState.class);
        when(targetState.getName()).thenReturn("FundsTransfers_new");
        when(targetState.getEntityName()).thenReturn("FundsTransfer");
        when(targetState.getRel()).thenReturn("http://www.temenos.com/rels/new");
        Transition t = createMockTransition(
                createMockResourceState("account", "Account", false), 
                targetState);

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://www.temenos.com/rels/new", result.getRel());
    }

    @Test
    /*
     * 'self' link rel should be added
     */
    public void testLinkFixedRelationSelf() {
        ResourceState targetState = mock(ResourceState.class);
        when(targetState.getName()).thenReturn("FundsTransfer");
        when(targetState.getEntityName()).thenReturn("FundsTransfer");
        when(targetState.getRel()).thenReturn("self");
        Transition t = createMockTransition(
                createMockResourceState("account", "Account", false), 
                targetState);

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("self", result.getRel());
    }

    @Test
    /*
     * 'self' link rel should be added
     */
    public void testLinkFixedRelationSelfCollection() {
        ResourceState targetState = mock(ResourceState.class);
        when(targetState.getName()).thenReturn("FundsTransfer");
        when(targetState.getEntityName()).thenReturn("FundsTransfer");
        when(targetState.getRel()).thenReturn("self");
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                targetState);

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("self", result.getRel());
    }

    @Test
    /*
     * 'edit' link rel should be added
     */
    public void testLinkFixedRelationEditCollection() {
        ResourceState sourceState = createMockResourceState("FundsTransfers", "FundsTransfer", true);
        // edit
        ResourceState targetStateEdit = mock(ResourceState.class);
        when(targetStateEdit.getName()).thenReturn("FundsTransfers_new");
        when(targetStateEdit.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateEdit.getRel()).thenReturn("edit");
        Transition editTransition = createMockTransition(
                sourceState, 
                targetStateEdit);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        
        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(editLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        Link result = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("edit", result.getRel());
    }

    @Test
    /*
     * 'edit' link rel is a special case that should be treated like 'self'
     */
    public void testLinkFixedRelationEdit() {
        ResourceState targetState = mock(ResourceState.class);
        when(targetState.getName()).thenReturn("FundsTransfers_new");
        when(targetState.getEntityName()).thenReturn("FundsTransfer");
        when(targetState.getRel()).thenReturn("edit");
        Transition t = createMockTransition(
                createMockResourceState("account", "Account", false), 
                targetState);

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("edit", result.getRel());
    }

    @Test
    /*
     * 'edit' link rel is a special case that should be treated like 'self'
     * Prefer 'edit' and drop the unwanted 'self' link.
     */
    public void testLinkFixedRelationEditSelf() {
        ResourceState sourceState = createMockResourceState("account", "Account", false);
        // edit
        ResourceState targetStateEdit = mock(ResourceState.class);
        when(targetStateEdit.getName()).thenReturn("FundsTransfers_new");
        when(targetStateEdit.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateEdit.getRel()).thenReturn("edit");
        Transition editTransition = createMockTransition(
                sourceState, 
                targetStateEdit);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        // self
        ResourceState targetStateSelf = mock(ResourceState.class);
        when(targetStateSelf.getName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getRel()).thenReturn("self");
        Transition selfTransition = createMockTransition(
                sourceState, 
                targetStateSelf);
        Link selfLink = new Link(selfTransition, selfTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        
        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(selfLink);
        mockLinks.add(editLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        
        Link resultEdit = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("edit", resultEdit.getRel());
        Link resultSelf = linkInterceptor.addingLink(mockResource, selfLink);
        assertNull(resultSelf);
    }

    @Test
    /*
     * 'edit' link rel is a special case that should be treated like 'self'
     * Prefer 'edit' and drop the unwanted 'self' link.
     */
    public void testLinkFixedRelationEditSelfCollection() {
        ResourceState sourceState = createMockResourceState("FundsTransfers", "FundsTransfer", true);
        // edit
        ResourceState targetStateEdit = mock(ResourceState.class);
        when(targetStateEdit.getName()).thenReturn("FundsTransfers_new");
        when(targetStateEdit.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateEdit.getRel()).thenReturn("edit");
        Transition editTransition = createMockTransition(
                sourceState, 
                targetStateEdit);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        // self
        ResourceState targetStateSelf = mock(ResourceState.class);
        when(targetStateSelf.getName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getRel()).thenReturn("self");
        Transition selfTransition = createMockTransition(
                sourceState, 
                targetStateSelf);
        Link selfLink = new Link(selfTransition, selfTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        
        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(selfLink);
        mockLinks.add(editLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        
        Link resultEdit = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("edit", resultEdit.getRel());
        Link resultSelf = linkInterceptor.addingLink(mockResource, selfLink);
        assertNull(resultSelf);
    }

    @Test
    /*
     * 'edit' link rel is a special case that should be treated like 'self'
     * Prefer 'edit' and drop the unwanted 'self' link.
     */
    public void testLinkFixedRelationSelfEditCollection() {
        ResourceState sourceState = createMockResourceState("FundsTransfers", "FundsTransfer", true);
        // edit
        ResourceState targetStateEdit = mock(ResourceState.class);
        when(targetStateEdit.getName()).thenReturn("FundsTransfers_new");
        when(targetStateEdit.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateEdit.getRel()).thenReturn("edit");
        Transition editTransition = createMockTransition(
                sourceState, 
                targetStateEdit);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        // self
        ResourceState targetStateSelf = mock(ResourceState.class);
        when(targetStateSelf.getName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateSelf.getRel()).thenReturn("self");
        Transition selfTransition = createMockTransition(
                sourceState, 
                targetStateSelf);
        Link selfLink = new Link(selfTransition, selfTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.GET);
        
        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(editLink);
        mockLinks.add(selfLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        
        Link resultEdit = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("edit", resultEdit.getRel());
        Link resultSelf = linkInterceptor.addingLink(mockResource, selfLink);
        assertNull(resultSelf);
    }

    @Test
    /*
     * When two links have the same rel, id and href we should remove all but the first link
     */
    public void testLinkRemoveDuplicates() {
        ResourceState sourceState = createMockResourceState("account", "Account", false);
        // edit
        ResourceState targetStateUpdate = mock(ResourceState.class);
        when(targetStateUpdate.getName()).thenReturn("FundsTransfers_new");
        when(targetStateUpdate.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateUpdate.getRel()).thenReturn("edit");
        when(targetStateUpdate.getId()).thenReturn("id");
        Transition editTransition = createMockTransition(
                sourceState, 
                targetStateUpdate);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.POST);
        // edit2
        ResourceState targetStateDelete = mock(ResourceState.class);
        when(targetStateDelete.getName()).thenReturn("FundsTransfers_delete");
        when(targetStateDelete.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateDelete.getRel()).thenReturn("edit");
        when(targetStateDelete.getId()).thenReturn("id");
        Transition edit2Transition = createMockTransition(
                sourceState, 
                targetStateDelete);
        Link edit2Link = new Link(edit2Transition, edit2Transition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.DELETE);

        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(editLink);
        mockLinks.add(edit2Link);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);

        Link resultEdit = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("edit", resultEdit.getRel());

        // Because it has same rel, id and href second link should not be present.
        Link resultEdit2 = linkInterceptor.addingLink(mockResource, edit2Link);
        assertNull(resultEdit2);
    }
    
    @Test
    /*
     * When two links have the same rel and href but different id we should NOT remove all but the first link
     */
    public void testLinkNoRemoveNonDuplicates() {
        ResourceState sourceState = createMockResourceState("account", "Account", false);
        // edit
        ResourceState targetStateUpdate = mock(ResourceState.class);
        when(targetStateUpdate.getName()).thenReturn("FundsTransfers_new");
        when(targetStateUpdate.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateUpdate.getRel()).thenReturn("aRelation");
        when(targetStateUpdate.getId()).thenReturn("id");
        Transition editTransition = createMockTransition(
            sourceState, 
            targetStateUpdate);
        Link editLink = new Link(editTransition, editTransition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.POST);
        // edit2
        ResourceState targetStateDelete = mock(ResourceState.class);
        when(targetStateDelete.getName()).thenReturn("FundsTransfers_delete");
        when(targetStateDelete.getEntityName()).thenReturn("FundsTransfer");
        when(targetStateDelete.getRel()).thenReturn("aRelation");
        when(targetStateDelete.getId()).thenReturn("anotherId");
        Transition edit2Transition = createMockTransition(
            sourceState, 
            targetStateDelete);
        Link edit2Link = new Link(edit2Transition, edit2Transition.getTarget().getRel(), "/FundsTransfers('123')", HttpMethod.DELETE);

        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(editLink);
        mockLinks.add(edit2Link);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);

        Link resultEdit = linkInterceptor.addingLink(mockResource, editLink);
        assertEquals("aRelation", resultEdit.getRel());

        // Because it has a different id second link should be present.
        Link resultEdit2 = linkInterceptor.addingLink(mockResource, edit2Link);
        assertEquals("aRelation", resultEdit2.getRel());
    }

    @Test
    /*
     * When two links a link with a relation, that has the same href as 'self' we don't
     * want to keep both
     */
    public void testLinkSelfSharingHref() {
        ResourceState sourceState = createMockResourceState("customer", "Customer", true);
        // see
        ResourceState targetStateUpdate = mock(ResourceState.class);
        when(targetStateUpdate.getName()).thenReturn("customer_see");
        when(targetStateUpdate.getEntityName()).thenReturn("Customer");
        when(targetStateUpdate.getRel()).thenReturn("self");
        Transition seeTransition = createMockTransition(
                sourceState, 
                targetStateUpdate);
        Link seeLink = new Link(seeTransition, seeTransition.getTarget().getRel(), "/Customers('123')", HttpMethod.GET);
        // input
        ResourceState targetStateInput = mock(ResourceState.class);
        when(targetStateInput.getName()).thenReturn("customer_input");
        when(targetStateInput.getEntityName()).thenReturn("Customer");
        when(targetStateInput.getRel()).thenReturn("input");
        Transition inputTransition = createMockTransition(
                sourceState, 
                targetStateInput);
        Link inputLink = new Link(inputTransition, inputTransition.getTarget().getRel(), "/Customers('123')", HttpMethod.PUT);

        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(seeLink);
        mockLinks.add(inputLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderCustomers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        
        Link resultSee = linkInterceptor.addingLink(mockResource, seeLink);
        assertEquals("self", resultSee.getRel());
        Link resultInput = linkInterceptor.addingLink(mockResource, inputLink);
        assertEquals("input", resultInput.getRel());
    }

    @Test
    /*
     * In some of the OData4j tests we expect to only receive the 'self' link in this case
     */
    public void testLinkSelfWithInitialCollectionToCollectionSameEntity() {
        ResourceState sourceState = createMockResourceState("customer", "Customer", true);
        // see
        ResourceState targetStateUpdate = mock(ResourceState.class);
        when(targetStateUpdate.getName()).thenReturn("customer_see");
        when(targetStateUpdate.getEntityName()).thenReturn("Customer");
        when(targetStateUpdate.getRel()).thenReturn("self");
        Transition seeTransition = createMockTransition(
                sourceState, 
                targetStateUpdate);
        Link seeLink = new Link(seeTransition, seeTransition.getTarget().getRel(), "/Customers('123')", HttpMethod.GET);
        // create
        ResourceState targetStateCreate = createMockResourceState("customer_create", "Customer", true);
        Transition createTransition = createMockTransition(
                sourceState, 
                targetStateCreate);
        Link inputLink = new Link(createTransition, createTransition.getTarget().getRel(), "/Customers('123')", HttpMethod.POST);

        List<Link> mockLinks = new ArrayList<Link>();
        mockLinks.add(seeLink);
        mockLinks.add(inputLink);
        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderCustomers());
        RESTResource mockResource = mock(RESTResource.class);
        when(mockResource.getLinks()).thenReturn(mockLinks);
        
        Link resultSee = linkInterceptor.addingLink(mockResource, seeLink);
        assertEquals("self", resultSee.getRel());
        Link resultInput = linkInterceptor.addingLink(mockResource, inputLink);
        assertNull(resultInput);
//      assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Customers", resultInput.getRel());
    }


    @Test
    public void testLinkRelationInitialCollectionToCollectionSameEntity() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfers", "FundsTransfer", true), 
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfers", result.getRel());
    }

    @Test
    public void testLinkRelationCollectionToCollectionSameEntity() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockResourceState("FundsTransfersIHold", "FundsTransfer", true));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfers", result.getRel());
    }
    
    @Test
    public void testLinkWithFieldLabelPresent() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockResourceState("FundsTransfersIHold", "FundsTransfer", true));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, "Account"));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Account/FundsTransfers", result.getRel());
    }
    
    @Test
    public void testLinkWithNullFieldLabel() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockResourceState("FundsTransfersIHold", "FundsTransfer", true));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, null));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfers", result.getRel());
    }
    
    @Test
    public void testLinkRelCreationWithRelNotProvided() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "FundsTransfer", null));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, null));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/FundsTransfers", result.getRel());
    }
    
    @Test
    public void testLinkRelCreationWithRelPartiallyProvided() {
        String targetRel = "http://temenostech.com/ado/2007/08/TARGET";
        String[] rels = new String[]{targetRel};
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "FundsTransfer", rels));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, null));
        assertEquals(targetRel, result.getRel());
    }
    
    @Test
    public void testLinkRelCreationWithRelFullyProvided() {
        String descriptionRel = XmlFormatWriter.related + "DESCRIPTION";
        String targetRel = "http://temenostech.com/ado/2007/08/TARGET";
        String[] rels = new String[]{descriptionRel, targetRel};
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "FundsTransfer", rels));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, null));
        assertEquals(descriptionRel + " " + targetRel, result.getRel());
    }
    
    @Test
    public void testLinkRelCreationWithRelProvidedForMultivalue() {
        String descriptionRel = XmlFormatWriter.related + "/DESCRIPTION";
        String targetRel = "http://temenostech.com/ado/2007/08/TARGET";
        String[] rels = new String[]{descriptionRel, targetRel};
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "FundsTransfer", rels));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, "Account"));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Account/FundsTransfers " + targetRel, result.getRel());
    }
    
    @Test
    public void testLinkRelCreationWithRelNotProvidedForMultivalue() {
        Transition t = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true), 
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "FundsTransfer", null));

        ODataLinkInterceptor linkInterceptor = new ODataLinkInterceptor(createMockProviderFundsTransfers());
        Link result = linkInterceptor.addingLink(mock(RESTResource.class), new Link(t, t.getTarget().getRel(), "/FundsTransfers()?$filter=DebitAcctNo eq '123'", HttpMethod.GET, "Account"));
        assertEquals("http://schemas.microsoft.com/ado/2007/08/dataservices/related/Account/FundsTransfers", result.getRel());
    }

    @Test
    public void testGetODataLinkRelation() {
        checkODataLinkRelationRetrieval(new Link(null,null,"something",null,null,null,null,null), "test", "something");

        String descriptionRel = XmlFormatWriter.related + "/DESCRIPTION";
        String targetRel = "http://temenostech.com/ado/2007/08/TARGET";

        //From ResourceState to CollectionResourceState - No field label
        Transition transitionMock = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "SourceFundsTransfer", true),
                createMockCollectionResourceStateWithRel("FundsTransfersIHold", "TargetFundsTransfer", null));
        checkODataLinkRelationRetrieval(transitionMock, null, targetRel, "test", targetRel);
        checkODataLinkRelationRetrieval(transitionMock, null, descriptionRel, "test", descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, targetRel + " " + descriptionRel, "test", targetRel + " " + descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, "item", "test", XmlFormatWriter.related + "test");
        checkODataLinkRelationRetrieval(transitionMock, null, "collection", "test", XmlFormatWriter.related + "test");
        checkODataLinkRelationRetrieval(transitionMock, null, "self", "test", "self");
        checkODataLinkRelationRetrieval(transitionMock, null, "", "", XmlFormatWriter.related);

        //From ResourceState to CollectionResourceState - field label provided
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", targetRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/test " + targetRel);
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", descriptionRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/test");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", targetRel + " " + descriptionRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/test " + targetRel);
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "item", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/test");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "collection", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/test");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "self", "test", "self");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "", "", XmlFormatWriter.related + "SourceFundsTransfer_sev/");

        //From ResourceState to ResourceState - No field label and source same as target
        transitionMock = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "FundsTransfer", true),
                createMockResourceState("FundsTransfersIHold", "FundsTransfer", false));

        checkODataLinkRelationRetrieval(transitionMock, null, targetRel, "test", targetRel);
        checkODataLinkRelationRetrieval(transitionMock, null, descriptionRel, "test", descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, targetRel + " " + descriptionRel, "test", targetRel + " " + descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, "item", "test", "self");
        checkODataLinkRelationRetrieval(transitionMock, null, "collection", "test", "self");
        checkODataLinkRelationRetrieval(transitionMock, null, "self", "test", "self");

        //From ResourceState to ResourceState - No field label and source different from target
        transitionMock = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "SourceFundsTransfer", false),
                createMockResourceState("FundsTransfersIHold", "TargetFundsTransfer", false));
        checkODataLinkRelationRetrieval(transitionMock, null, targetRel, "test", targetRel);
        checkODataLinkRelationRetrieval(transitionMock, null, descriptionRel, "test", descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, targetRel + " " + descriptionRel, "test", targetRel + " " + descriptionRel);
        checkODataLinkRelationRetrieval(transitionMock, null, "item", "test", XmlFormatWriter.related + "TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, null, "collection", "test", XmlFormatWriter.related + "TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, null, "self", "test", "self");
        
        //From ResourceState to ResourceState - field label provided and source different from target
        transitionMock = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "SourceFundsTransfer", false),
                createMockResourceState("FundsTransfersIHold", "TargetFundsTransfer", false));
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", targetRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer " + targetRel);
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", descriptionRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", targetRel + " " + descriptionRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer " + targetRel);
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "item", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "collection", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "self", "test", "self");
        
      //From ResourceState to ResourceState - field label provided using oldTemenosRel
        transitionMock = createMockTransition(
                createMockResourceState("FundsTransfersIAuth", "SourceFundsTransfer", false),
                createMockResourceState("FundsTransfersIHold", "TargetFundsTransfer", false));
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "http://www.temenos.com/rels/leafVal", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/leafVal http://www.temenos.com/rels/leafVal");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "http://www.temenos.com/rels/leafVal", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/leafVal http://www.temenos.com/rels/leafVal");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "http://www.temenos.com/rels/leafVal" + " " + descriptionRel, "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/leafVal http://www.temenos.com/rels/leafVal");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "item", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "collection", "test", XmlFormatWriter.related + "SourceFundsTransfer_sev/TargetFundsTransfer");
        checkODataLinkRelationRetrieval(transitionMock, "SourceFundsTransfer_sev", "self", "test", "self");
    }

    private void checkODataLinkRelationRetrieval(Transition transition, String fieldLabel, String rel, String entitySetName, String expected) {
        checkODataLinkRelationRetrieval(new Link(transition, rel, null, null, fieldLabel), entitySetName, expected);
    }

    private void checkODataLinkRelationRetrieval(Link link, String entitySetName, String expected) {
        ODataLinkInterceptor oDataLinkInterceptor = new ODataLinkInterceptor(null);
        String result = oDataLinkInterceptor.getODataLinkRelation(link, entitySetName);
        assertEquals(expected, result);
    }

    private ResourceState createMockResourceState(String name, String entityName, boolean isCollection) {
        ResourceState state = null;
        if (isCollection) {
            state = new CollectionResourceState(entityName, name, new ArrayList<Action>(), "/"+name);
        } else {
            state = new ResourceState(entityName, name, new ArrayList<Action>(), "/"+name);
        }
        return state; 
    }
    
    private ResourceState createMockCollectionResourceStateWithRel(String name, String entityName, String[] rels) {
        ResourceState state = new CollectionResourceState(entityName, name, new ArrayList<Action>(), "/"+name, rels , null);
        return state; 
    }

    private Transition createMockTransition(ResourceState source, ResourceState target) {
        Transition.Builder builder = new Transition.Builder();
        builder.source(source);
        builder.target(target);
        builder.method("GET");
        return builder.build();
    }
}